<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width initial-scale=1.0" />
</head>
<body>
<script>

const viewportTag = document.getElementsByTagName('meta')[0];
const defaultViewportContent = viewportTag.getAttribute('content');

function setViewportFit(value) {
  viewportTag.setAttribute('content', defaultViewportContent + ', viewport-fit=' + value);
}

</script>
</body>
</html>
